/*-
* Copyright (c) 2009 Xin LI
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include
__FBSDID("$FreeBSD: src/lib/libc/string/strlen.c,v 1.7 2009/01/26 07:31:28 delphij Exp $");
#include
#include
#include
/*
* Portable strlen() for 32-bit and 64-bit systems.
*
* Rationale: it is generally much more efficient to do word length
* operations and avoid branches on modern computer systems, as
* compared to byte-length operations with a lot of branches.
*
* The expression:
*
* ((x - 0x01....01) & ~x & 0x80....80)
*
* would evaluate to a non-zero value iff any of the bytes in the
* original word is zero. However, we can further reduce ~1/3 of
* time if we consider that strlen() usually operate on 7-bit ASCII
* by employing the following expression, which allows false positive
* when high bit of 1 and use the tail case to catch these case:
*
* ((x - 0x01....01) & 0x80....80)
*
* This is more than 5.2 times as fast as the raw implementation on
* Intel T7300 under long mode for strings longer than word length.
*/
/* Magic numbers for the algorithm */
#if LONG_BIT == 32
static const unsigned long mask01 = 0x01010101;
static const unsigned long mask80 = 0x80808080;
#elif LONG_BIT == 64
static const unsigned long mask01 = 0x0101010101010101;
static const unsigned long mask80 = 0x8080808080808080;
#else
#error Unsupported word size
#endif
#define LONGPTR_MASK (sizeof(long) - 1)
/*
* Helper macro to return string length if we caught the zero
* byte.
*/
#define testbyte(x) \
do { \
if (p[x] == '\0') \
return (p - str + x); \
} while (0)
size_t
strlen(const char *str)
{
const char *p;
const unsigned long *lp;
/* Skip the first few bytes until we have an aligned p */
for (p = str; (uintptr_t)p & LONGPTR_MASK; p++)
if (*p == '\0')
return (p - str);
/* Scan the rest of the string using word sized operation */
for (lp = (const unsigned long *)p; ; lp++)
if ((*lp - mask01) & mask80) {
p = (const char *)(lp);
testbyte(0);
testbyte(1);
testbyte(2);
testbyte(3);
#if (LONG_BIT >= 64)
testbyte(4);
testbyte(5);
testbyte(6);
testbyte(7);
#endif
}
/* NOTREACHED */
return (0);
}